LXR uboot/drivers/watchdog/s5p

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2012 Samsung Electronics
   4 * Minkyu Kang <mk7.kang@samsung.com>
   5 */
   6
   7#include <common.h>
   8#include <asm/io.h>
   9#include <asm/arch/watchdog.h>
  10
  11#define PRESCALER_VAL 255
  12
  13void wdt_stop(void)
  14{
  15        struct s5p_watchdog *wdt =
  16                (struct s5p_watchdog *)samsung_get_base_watchdog();
  17        unsigned int wtcon;
  18
  19        wtcon = readl(&wdt->wtcon);
  20        wtcon &= ~(WTCON_EN | WTCON_INT | WTCON_RESET);
  21
  22        writel(wtcon, &wdt->wtcon);
  23}
  24
  25void wdt_start(unsigned int timeout)
  26{
  27        struct s5p_watchdog *wdt =
  28                (struct s5p_watchdog *)samsung_get_base_watchdog();
  29        unsigned int wtcon;
  30
  31        wdt_stop();
  32
  33        wtcon = readl(&wdt->wtcon);
  34        wtcon |= (WTCON_EN | WTCON_CLK(WTCON_CLK_128));
  35        wtcon &= ~WTCON_INT;
  36        wtcon |= WTCON_RESET;
  37        wtcon |= WTCON_PRESCALER(PRESCALER_VAL);
  38
  39        writel(timeout, &wdt->wtdat);
  40        writel(timeout, &wdt->wtcnt);
  41        writel(wtcon, &wdt->wtcon);
  42}
  43